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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details)
 1 Months Ended 3 Months Ended
Nov. 30, 2019
USD ($)
agreement
Nov. 30, 2019
PEN (S/)
agreement
Mar. 31, 2019
USD ($)
item
Mar. 31, 2019
PEN (S/)
item
Aug. 31, 2018
USD ($)
item
Jun. 30, 2018
Mar. 31, 2020
USD ($)
item
employee
Dec. 31, 2018
PEN (S/)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
PEN (S/)
Aug. 22, 2018
USD ($)
Year Three Collective Bargaining Agreement                      
Labor matters                      
Labor expense | $ $ 13,600                    
Labor Matters                      
Labor matters                      
Annual salary increase (as a percent) 5.00% 5.00%                  
Number of agreements signed | agreement 2 2                  
Labor Matters | Year One Collective Bargaining Agreement                      
Labor matters                      
Term of agreement 1 year 1 year                  
Labor expense $ 4,500 S/ 15,000                  
Labor Matters | Year Three Collective Bargaining Agreement                      
Labor matters                      
Term of agreement 3 years 3 years                  
Labor expense | S/   S/ 45,000                  
Peru | Labor Matters                      
Labor matters                      
Percentage of labor unionized             64.80%        
Total number of workers | employee             4,886        
Number of labor unions             6        
Number of labor unions represent majority of workers             1        
Number of labor unions other than majority workers unions             5        
Term of agreement         3 years 3 years          
Annual salary increase (as a percent)     5.00% 5.00%       5.00% 5.00% 5.00%  
Labor expense     $ 13,600 S/ 45,000 $ 13,600     S/ 45,000 $ 13,600 S/ 45,000  
Number of additional unions     1 1 3            
Mexico | San Martin                      
Labor matters                      
Budgeted cost for rehabilitation of mine | $                     $ 97,700,000
Total expense incurred on rehabilitation of mine till date | $             $ 78,600,000